ALSA project - the C library reference

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Functions
control.c File Reference

CTL interface - primitive controls. More...

## Functions
const char * | snd_ctl_name (snd_ctl_t *ctl)
| get identifier of CTL handle
snd_ctl_type_t | snd_ctl_type (snd_ctl_t *ctl)
| get type of CTL handle
int | snd_ctl_close (snd_ctl_t *ctl)
| close CTL handle
int | snd_ctl_nonblock (snd_ctl_t *ctl, int nonblock)
| set nonblock mode
int | snd_ctl_poll_descriptors_count (snd_ctl_t *ctl)
| get count of poll descriptors for CTL handle
int | snd_ctl_poll_descriptors (snd_ctl_t *ctl, struct pollfd *pfds, unsigned int space)
| get poll descriptors
int | snd_ctl_poll_descriptors_revents (snd_ctl_t *ctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
| get returned events from poll descriptors
int | snd_ctl_subscribe_events (snd_ctl_t *ctl, int subscribe)
| Ask to be informed about events (poll, snd_async_add_ctl_handler, snd_ctl_read)
int | snd_ctl_card_info (snd_ctl_t *ctl, snd_ctl_card_info_t *info)
| Get information about the sound card.
int | snd_ctl_elem_list (snd_ctl_t *ctl, snd_ctl_elem_list_t *list)
| Get a list of element identifiers.
int | snd_ctl_elem_info (snd_ctl_t *ctl, snd_ctl_elem_info_t *info)
| Get CTL element information.
int | snd_ctl_add_integer_elem_set (snd_ctl_t *ctl, snd_ctl_elem_info_t *info, unsigned int element_count, unsigned int member_count, long min, long max, long step)
| Create and add some user-defined control elements of integer type.
int | snd_ctl_add_integer64_elem_set (snd_ctl_t *ctl, snd_ctl_elem_info_t *info, unsigned int element_count, unsigned int member_count, long long min, long long max, long long step)
| Create and add some user-defined control elements of integer64 type.
int | snd_ctl_add_boolean_elem_set (snd_ctl_t *ctl, snd_ctl_elem_info_t *info, unsigned int element_count, unsigned int member_count)
| Create and add some user-defined control elements of boolean type.
int | snd_ctl_add_enumerated_elem_set (snd_ctl_t *ctl, snd_ctl_elem_info_t *info, unsigned int element_count, unsigned int member_count, unsigned int items, const char *const labels[])
| Create and add some user-defined control elements of enumerated type.
int | snd_ctl_add_bytes_elem_set (snd_ctl_t *ctl, snd_ctl_elem_info_t *info, unsigned int element_count, unsigned int member_count)
| Create and add some user-defined control elements of bytes type.
int | snd_ctl_elem_add_integer (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int member_count, long min, long max, long step)
| Create and add an user-defined control element of integer type.
int | snd_ctl_elem_add_integer64 (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int member_count, long long min, long long max, long long step)
| Create and add an user-defined control element of integer64 type.
int | snd_ctl_elem_add_boolean (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int member_count)
| Create and add an user-defined control element of boolean type.
int | snd_ctl_elem_add_enumerated (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int member_count, unsigned int items, const char *const labels[])
| Create and add a user-defined control element of enumerated type.
int | snd_ctl_elem_add_iec958 (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id)
| Create and add a user-defined control element of IEC958 type.
int | snd_ctl_elem_remove (snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
| Remove an user CTL element.
int | snd_ctl_elem_read (snd_ctl_t *ctl, snd_ctl_elem_value_t *data)
| Get CTL element value.
int | snd_ctl_elem_write (snd_ctl_t *ctl, snd_ctl_elem_value_t *data)
| Set CTL element value.
int | snd_ctl_elem_tlv_read (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int *tlv, unsigned int tlv_size)
| Read structured data from an element set to given buffer.
int | snd_ctl_elem_tlv_write (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, const unsigned int *tlv)
| Write structured data from given buffer to an element set.
int | snd_ctl_elem_tlv_command (snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, const unsigned int *tlv)
| Process structured data from given buffer for an element set.
int | snd_ctl_elem_lock (snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
| Lock CTL element.
int | snd_ctl_elem_unlock (snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
| Unlock CTL element.
int | snd_ctl_hwdep_next_device (snd_ctl_t *ctl, int *device)
| Get next hardware dependent device number.
int | snd_ctl_hwdep_info (snd_ctl_t *ctl, snd_hwdep_info_t *info)
| Get info about a hardware dependent device.
int | snd_ctl_pcm_next_device (snd_ctl_t *ctl, int *device)
| Get next PCM device number.
int | snd_ctl_pcm_info (snd_ctl_t *ctl, snd_pcm_info_t *info)
| Get info about a PCM device.
int | snd_ctl_pcm_prefer_subdevice (snd_ctl_t *ctl, int subdev)
| Set preferred PCM subdevice number of successive PCM open.
int | snd_ctl_rawmidi_next_device (snd_ctl_t *ctl, int *device)
| Get next RawMidi device number.
int | snd_ctl_rawmidi_info (snd_ctl_t *ctl, snd_rawmidi_info_t *info)
| Get info about a RawMidi device.
int | snd_ctl_rawmidi_prefer_subdevice (snd_ctl_t *ctl, int subdev)
| Set preferred RawMidi subdevice number of successive RawMidi open.
int | snd_ctl_ump_next_device (snd_ctl_t *ctl, int *device)
| Get next UMP device number.
int | snd_ctl_ump_endpoint_info (snd_ctl_t *ctl, snd_ump_endpoint_info_t *info)
| Get UMP Endpoint info about a UMP RawMidi device.
int | snd_ctl_ump_block_info (snd_ctl_t *ctl, snd_ump_block_info_t *info)
| Get UMP Block info about a UMP RawMidi device.
int | snd_ctl_set_power_state (snd_ctl_t *ctl, unsigned int state)
| Set Power State to given SND_CTL_POWER_* value and do the power management.
int | snd_ctl_get_power_state (snd_ctl_t *ctl, unsigned int *state)
| Get actual Power State.
int | snd_ctl_read (snd_ctl_t *ctl, snd_ctl_event_t *event)
| Read an event.
int | snd_ctl_wait (snd_ctl_t *ctl, int timeout)
| Wait for a CTL to become ready (i.e. at least one event pending)
int | snd_async_add_ctl_handler (snd_async_handler_t **handler, snd_ctl_t *ctl, snd_async_callback_t callback, void *private_data)
| Add an async handler for a CTL.
snd_ctl_t * | snd_async_handler_get_ctl (snd_async_handler_t *handler)
| Return CTL handle related to an async handler.
int | snd_ctl_open (snd_ctl_t **ctlp, const char *name, int mode)
| Opens a sound card.
int | snd_ctl_open_lconf (snd_ctl_t **ctlp, const char *name, int mode, snd_config_t *lconf)
| Opens a CTL using local configuration.
int | snd_ctl_open_fallback (snd_ctl_t **ctlp, snd_config_t *root, const char *name, const char *orig_name, int mode)
| Opens a fallback CTL.
const char * | snd_ctl_elem_type_name (snd_ctl_elem_type_t type)
| get name of a CTL element type
const char * | snd_ctl_elem_iface_name (snd_ctl_elem_iface_t iface)
| get name of a CTL element related interface
const char * | snd_ctl_event_type_name (snd_ctl_event_type_t type)
| get name of a CTL event type
int | snd_ctl_elem_list_alloc_space (snd_ctl_elem_list_t *obj, unsigned int entries)
| allocate space for CTL element identifiers list
void | snd_ctl_elem_list_free_space (snd_ctl_elem_list_t *obj)
| free previously allocated space for CTL element identifiers list
unsigned int | snd_ctl_event_elem_get_mask (const snd_ctl_event_t *obj)
| Get event mask for an element related event.
void | snd_ctl_event_elem_get_id (const snd_ctl_event_t *obj, snd_ctl_elem_id_t *ptr)
| Get CTL element identifier for an element related event.
unsigned int | snd_ctl_event_elem_get_numid (const snd_ctl_event_t *obj)
| Get element numeric identifier for an element related event.
snd_ctl_elem_iface_t | snd_ctl_event_elem_get_interface (const snd_ctl_event_t *obj)
| Get interface part of CTL element identifier for an element related event.
unsigned int | snd_ctl_event_elem_get_device (const snd_ctl_event_t *obj)
| Get device part of CTL element identifier for an element related event.
unsigned int | snd_ctl_event_elem_get_subdevice (const snd_ctl_event_t *obj)
| Get subdevice part of CTL element identifier for an element related event.
const char * | snd_ctl_event_elem_get_name (const snd_ctl_event_t *obj)
| Get name part of CTL element identifier for an element related event.
unsigned int | snd_ctl_event_elem_get_index (const snd_ctl_event_t *obj)
| Get index part of CTL element identifier for an element related event.
size_t | snd_ctl_elem_id_sizeof ()
| get size of snd_ctl_elem_id_t
int | snd_ctl_elem_id_malloc (snd_ctl_elem_id_t **ptr)
| allocate an invalid snd_ctl_elem_id_t using standard malloc
void | snd_ctl_elem_id_free (snd_ctl_elem_id_t *obj)
| frees a previously allocated snd_ctl_elem_id_t
void | snd_ctl_elem_id_clear (snd_ctl_elem_id_t *obj)
| clear given snd_ctl_elem_id_t object
void | snd_ctl_elem_id_copy (snd_ctl_elem_id_t *dst, const snd_ctl_elem_id_t *src)
| copy one snd_ctl_elem_id_t to another
int | snd_ctl_elem_id_compare_numid (const snd_ctl_elem_id_t *id1, const snd_ctl_elem_id_t *id2)
| compare one snd_ctl_elem_id_t to another using numid
int | snd_ctl_elem_id_compare_set (const snd_ctl_elem_id_t *id1, const snd_ctl_elem_id_t *id2)
| compare one snd_ctl_elem_id_t to another
unsigned int | snd_ctl_elem_id_get_numid (const snd_ctl_elem_id_t *obj)
| Get numeric identifier from a CTL element identifier.
snd_ctl_elem_iface_t | snd_ctl_elem_id_get_interface (const snd_ctl_elem_id_t *obj)
| Get interface part of a CTL element identifier.
unsigned int | snd_ctl_elem_id_get_device (const snd_ctl_elem_id_t *obj)
| Get device part of a CTL element identifier.
unsigned int | snd_ctl_elem_id_get_subdevice (const snd_ctl_elem_id_t *obj)
| Get subdevice part of a CTL element identifier.
const char * | snd_ctl_elem_id_get_name (const snd_ctl_elem_id_t *obj)
| Get name part of a CTL element identifier.
unsigned int | snd_ctl_elem_id_get_index (const snd_ctl_elem_id_t *obj)
| Get index part of a CTL element identifier.
void | snd_ctl_elem_id_set_numid (snd_ctl_elem_id_t *obj, unsigned int val)
| Set numeric identifier for a CTL element identifier.
void | snd_ctl_elem_id_set_interface (snd_ctl_elem_id_t *obj, snd_ctl_elem_iface_t val)
| Set interface part for a CTL element identifier.
void | snd_ctl_elem_id_set_device (snd_ctl_elem_id_t *obj, unsigned int val)
| Set device part for a CTL element identifier.
void | snd_ctl_elem_id_set_subdevice (snd_ctl_elem_id_t *obj, unsigned int val)
| Set subdevice part for a CTL element identifier.
void | snd_ctl_elem_id_set_name (snd_ctl_elem_id_t *obj, const char *val)
| Set name part for a CTL element identifier.
void | snd_ctl_elem_id_set_index (snd_ctl_elem_id_t *obj, unsigned int val)
| Set index part for a CTL element identifier.
size_t | snd_ctl_card_info_sizeof ()
| get size of snd_ctl_card_info_t.
int | snd_ctl_card_info_malloc (snd_ctl_card_info_t **ptr)
| Allocate an invalid snd_ctl_card_info_t on the heap.
void | snd_ctl_card_info_free (snd_ctl_card_info_t *obj)
| Free an snd_ctl_card_info_t previously allocated using snd_ctl_card_info_malloc().
void | snd_ctl_card_info_clear (snd_ctl_card_info_t *obj)
| Clear given card info object.
void | snd_ctl_card_info_copy (snd_ctl_card_info_t *dst, const snd_ctl_card_info_t *src)
| Bitwise copy of a snd_ctl_card_info_t object.
int | snd_ctl_card_info_get_card (const snd_ctl_card_info_t *obj)
| Get the sound card index from the given info object.
const char * | snd_ctl_card_info_get_id (const snd_ctl_card_info_t *obj)
| Get the sound card ID from the given info object.
const char * | snd_ctl_card_info_get_driver (const snd_ctl_card_info_t *obj)
| Get the sound card driver from the given info object.
const char * | snd_ctl_card_info_get_name (const snd_ctl_card_info_t *obj)
| Get the sound card name from the given info object.
const char * | snd_ctl_card_info_get_longname (const snd_ctl_card_info_t *obj)
| Get the sound cards long name from the given info object.
const char * | snd_ctl_card_info_get_mixername (const snd_ctl_card_info_t *obj)
| Get the sound card mixer name from the given info object.
const char * | snd_ctl_card_info_get_components (const snd_ctl_card_info_t *obj)
| Get the sound cards "components" property from the given info object.
size_t | snd_ctl_event_sizeof ()
| get size of snd_ctl_event_t
int | snd_ctl_event_malloc (snd_ctl_event_t **ptr)
| allocate an invalid snd_ctl_event_t using standard malloc
void | snd_ctl_event_free (snd_ctl_event_t *obj)
| frees a previously allocated snd_ctl_event_t
void | snd_ctl_event_clear (snd_ctl_event_t *obj)
| clear given snd_ctl_event_t object
void | snd_ctl_event_copy (snd_ctl_event_t *dst, const snd_ctl_event_t *src)
| copy one snd_ctl_event_t to another
snd_ctl_event_type_t | snd_ctl_event_get_type (const snd_ctl_event_t *obj)
| Get type of a CTL event.
size_t | snd_ctl_elem_list_sizeof ()
| get size of snd_ctl_elem_list_t.
int | snd_ctl_elem_list_malloc (snd_ctl_elem_list_t **ptr)
| allocate a snd_ctl_elem_list_t using standard malloc.
void | snd_ctl_elem_list_free (snd_ctl_elem_list_t *obj)
| frees a previously allocated snd_ctl_elem_list_t.
void | snd_ctl_elem_list_clear (snd_ctl_elem_list_t *obj)
| Clear given snd_ctl_elem_list_t object.
void | snd_ctl_elem_list_copy (snd_ctl_elem_list_t *dst, const snd_ctl_elem_list_t *src)
| copy one snd_ctl_elem_list_t to another.
void | snd_ctl_elem_list_set_offset (snd_ctl_elem_list_t *obj, unsigned int val)
| Set index of first wanted CTL element identifier in a CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_used (const snd_ctl_elem_list_t *obj)
| Get number of used entries in CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_count (const snd_ctl_elem_list_t *obj)
| Get total count of elements present in CTL device.
void | snd_ctl_elem_list_get_id (const snd_ctl_elem_list_t *obj, unsigned int idx, snd_ctl_elem_id_t *ptr)
| Get CTL element identifier for an entry of a CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_numid (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get CTL element numeric identifier for an entry of a CTL element identifiers list.
snd_ctl_elem_iface_t | snd_ctl_elem_list_get_interface (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get interface part of CTL element identifier for an entry of a CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_device (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get the device part of CTL element identifier for an entry of a CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_subdevice (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get subdevice part of CTL element identifier for an entry of a CTL element identifiers list.
const char * | snd_ctl_elem_list_get_name (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get name part of CTL element identifier for an entry of a CTL element identifiers list.
unsigned int | snd_ctl_elem_list_get_index (const snd_ctl_elem_list_t *obj, unsigned int idx)
| Get index part of CTL element identifier for an entry of a CTL element identifiers list.
size_t | snd_ctl_elem_info_sizeof ()
| get size of snd_ctl_elem_info_t
int | snd_ctl_elem_info_malloc (snd_ctl_elem_info_t **ptr)
| allocate an invalid snd_ctl_elem_info_t using standard malloc
void | snd_ctl_elem_info_free (snd_ctl_elem_info_t *obj)
| frees a previously allocated snd_ctl_elem_info_t
void | snd_ctl_elem_info_clear (snd_ctl_elem_info_t *obj)
| clear given snd_ctl_elem_info_t object
void | snd_ctl_elem_info_copy (snd_ctl_elem_info_t *dst, const snd_ctl_elem_info_t *src)
| copy one snd_ctl_elem_info_t to another
snd_ctl_elem_type_t | snd_ctl_elem_info_get_type (const snd_ctl_elem_info_t *obj)
| Get type from a CTL element id/info.
int | snd_ctl_elem_info_is_readable (const snd_ctl_elem_info_t *obj)
| Get info about readability from a CTL element id/info.
int | snd_ctl_elem_info_is_writable (const snd_ctl_elem_info_t *obj)
| Get info about writability from a CTL element id/info.
int | snd_ctl_elem_info_is_volatile (const snd_ctl_elem_info_t *obj)
| Get info about notification feasibility from a CTL element id/info.
int | snd_ctl_elem_info_is_inactive (const snd_ctl_elem_info_t *obj)
| Get info about status from a CTL element id/info.
int | snd_ctl_elem_info_is_locked (const snd_ctl_elem_info_t *obj)
| Get info whether an element is locked.
int | snd_ctl_elem_info_is_owner (const snd_ctl_elem_info_t *obj)
| Get info if I own an element.
int | snd_ctl_elem_info_is_user (const snd_ctl_elem_info_t *obj)
| Get info if it's a user element.
int | snd_ctl_elem_info_is_tlv_readable (const snd_ctl_elem_info_t *obj)
| Get info about TLV readability from a CTL element id/info.
int | snd_ctl_elem_info_is_tlv_writable (const snd_ctl_elem_info_t *obj)
| Get info about TLV writeability from a CTL element id/info.
int | snd_ctl_elem_info_is_tlv_commandable (const snd_ctl_elem_info_t *obj)
| Get info about TLV command possibility from a CTL element id/info.
int | snd_ctl_elem_info_is_indirect (const snd_ctl_elem_info_t *obj)
| (DEPRECATED) Get info about values passing policy from a CTL element value
pid_t | snd_ctl_elem_info_get_owner (const snd_ctl_elem_info_t *obj)
| Get owner of a locked element.
unsigned int | snd_ctl_elem_info_get_count (const snd_ctl_elem_info_t *obj)
| Get number of value entries from a CTL element id/info.
long | snd_ctl_elem_info_get_min (const snd_ctl_elem_info_t *obj)
| Get minimum value from a SND_CTL_ELEM_TYPE_INTEGER CTL element id/info.
long | snd_ctl_elem_info_get_max (const snd_ctl_elem_info_t *obj)
| Get maximum value from a SND_CTL_ELEM_TYPE_INTEGER CTL element id/info.
long | snd_ctl_elem_info_get_step (const snd_ctl_elem_info_t *obj)
| Get value step from a SND_CTL_ELEM_TYPE_INTEGER CTL element id/info.
long long | snd_ctl_elem_info_get_min64 (const snd_ctl_elem_info_t *obj)
| Get minimum value from a SND_CTL_ELEM_TYPE_INTEGER64 CTL element id/info.
long long | snd_ctl_elem_info_get_max64 (const snd_ctl_elem_info_t *obj)
| Get maximum value from a SND_CTL_ELEM_TYPE_INTEGER64 CTL element id/info.
long long | snd_ctl_elem_info_get_step64 (const snd_ctl_elem_info_t *obj)
| Get value step from a SND_CTL_ELEM_TYPE_INTEGER64 CTL element id/info.
unsigned int | snd_ctl_elem_info_get_items (const snd_ctl_elem_info_t *obj)
| Get number of items available from a SND_CTL_ELEM_TYPE_ENUMERATED CTL element id/info.
void | snd_ctl_elem_info_set_item (snd_ctl_elem_info_t *obj, unsigned int val)
| Select item in a SND_CTL_ELEM_TYPE_ENUMERATED CTL element id/info.
const char * | snd_ctl_elem_info_get_item_name (const snd_ctl_elem_info_t *obj)
| Get name for selected item in a SND_CTL_ELEM_TYPE_ENUMERATED CTL element id/info.
int | snd_ctl_elem_info_get_dimensions (const snd_ctl_elem_info_t *obj)
| Get count of dimensions for given element.
int | snd_ctl_elem_info_get_dimension (const snd_ctl_elem_info_t *obj, unsigned int idx)
| Get specified of dimension width for given element.
int | snd_ctl_elem_info_set_dimension (snd_ctl_elem_info_t *info, const int dimension[4])
| Set width to a specified dimension level of given element information.
void | snd_ctl_elem_info_get_id (const snd_ctl_elem_info_t *obj, snd_ctl_elem_id_t *ptr)
| Get CTL element identifier of a CTL element id/info.
unsigned int | snd_ctl_elem_info_get_numid (const snd_ctl_elem_info_t *obj)
| Get element numeric identifier of a CTL element id/info.
snd_ctl_elem_iface_t | snd_ctl_elem_info_get_interface (const snd_ctl_elem_info_t *obj)
| Get interface part of CTL element identifier of a CTL element id/info.
unsigned int | snd_ctl_elem_info_get_device (const snd_ctl_elem_info_t *obj)
| Get device part of CTL element identifier of a CTL element id/info.
unsigned int | snd_ctl_elem_info_get_subdevice (const snd_ctl_elem_info_t *obj)
| Get subdevice part of CTL element identifier of a CTL element id/info.
const char * | snd_ctl_elem_info_get_name (const snd_ctl_elem_info_t *obj)
| Get name part of CTL element identifier of a CTL element id/info.
unsigned int | snd_ctl_elem_info_get_index (const snd_ctl_elem_info_t *obj)
| Get index part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_id (snd_ctl_elem_info_t *obj, const snd_ctl_elem_id_t *ptr)
| Set CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_numid (snd_ctl_elem_info_t *obj, unsigned int val)
| Set element numeric identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_interface (snd_ctl_elem_info_t *obj, snd_ctl_elem_iface_t val)
| Set interface part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_device (snd_ctl_elem_info_t *obj, unsigned int val)
| Set device part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_subdevice (snd_ctl_elem_info_t *obj, unsigned int val)
| Set subdevice part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_name (snd_ctl_elem_info_t *obj, const char *val)
| Set name part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_index (snd_ctl_elem_info_t *obj, unsigned int val)
| Set index part of CTL element identifier of a CTL element id/info.
void | snd_ctl_elem_info_set_read_write (snd_ctl_elem_info_t *obj, int rval, int wval)
| Set readability/writeability parameter of a CTL element id/info.
void | snd_ctl_elem_info_set_tlv_read_write (snd_ctl_elem_info_t *obj, int rval, int wval)
| Set TLV readability/writeability parameter of a CTL element id/info.
void | snd_ctl_elem_info_set_inactive (snd_ctl_elem_info_t *obj, int val)
| Set inactive parameter of a CTL element id/info.
size_t | snd_ctl_elem_value_sizeof ()
| Get size of data structure for an element.
int | snd_ctl_elem_value_malloc (snd_ctl_elem_value_t **ptr)
| Allocate an invalid snd_ctl_elem_value_t on the heap.
void | snd_ctl_elem_value_free (snd_ctl_elem_value_t *obj)
| Free an snd_ctl_elem_value_t previously allocated using snd_ctl_elem_value_malloc().
void | snd_ctl_elem_value_clear (snd_ctl_elem_value_t *obj)
| Clear given data of an element.
void | snd_ctl_elem_value_copy (snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src)
| Bitwise copy of a snd_ctl_elem_value_t value.
int | snd_ctl_elem_value_compare (snd_ctl_elem_value_t *left, const snd_ctl_elem_value_t *right)
| Compare two snd_ctl_elem_value_t values, bytewise.
void | snd_ctl_elem_value_get_id (const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr)
| Get the element identifier from the given element value.
unsigned int | snd_ctl_elem_value_get_numid (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'numid' part from the given element value.
snd_ctl_elem_iface_t | snd_ctl_elem_value_get_interface (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'interface' part from the given element value.
unsigned int | snd_ctl_elem_value_get_device (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'device' part from the given element value.
unsigned int | snd_ctl_elem_value_get_subdevice (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'subdevice' part from the given element value.
const char * | snd_ctl_elem_value_get_name (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'name' part from the given element value.
unsigned int | snd_ctl_elem_value_get_index (const snd_ctl_elem_value_t *obj)
| Get the identifiers 'index' part from the given element value.
void | snd_ctl_elem_value_set_id (snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_t *ptr)
| Set the element identifier within the given element value.
void | snd_ctl_elem_value_set_numid (snd_ctl_elem_value_t *obj, unsigned int val)
| Set the identifiers 'numid' part within the given element value.
void | snd_ctl_elem_value_set_interface (snd_ctl_elem_value_t *obj, snd_ctl_elem_iface_t val)
| Set the identifiers 'interface' part within the given element value.
void | snd_ctl_elem_value_set_device (snd_ctl_elem_value_t *obj, unsigned int val)
| Set the identifiers 'device' part within the given element value.
void | snd_ctl_elem_value_set_subdevice (snd_ctl_elem_value_t *obj, unsigned int val)
| Set the identifiers 'subdevice' part within the given element value.
void | snd_ctl_elem_value_set_name (snd_ctl_elem_value_t *obj, const char *val)
| Set the identifiers 'name' part within the given element value.
void | snd_ctl_elem_value_set_index (snd_ctl_elem_value_t *obj, unsigned int val)
| Set the identifiers 'index' part within the given element value.
int | snd_ctl_elem_value_get_boolean (const snd_ctl_elem_value_t *obj, unsigned int idx)
| Get an element members value.
long | snd_ctl_elem_value_get_integer (const snd_ctl_elem_value_t *obj, unsigned int idx)
| Get an element members value.
long long | snd_ctl_elem_value_get_integer64 (const snd_ctl_elem_value_t *obj, unsigned int idx)
| Get an element members value.
unsigned int | snd_ctl_elem_value_get_enumerated (const snd_ctl_elem_value_t *obj, unsigned int idx)
| Get an element members value.
unsigned char | snd_ctl_elem_value_get_byte (const snd_ctl_elem_value_t *obj, unsigned int idx)
| Get an element members value.
void | snd_ctl_elem_value_set_boolean (snd_ctl_elem_value_t *obj, unsigned int idx, long val)
| Set an element members value.
void | snd_ctl_elem_value_set_integer (snd_ctl_elem_value_t *obj, unsigned int idx, long val)
| Set an element members value.
void | snd_ctl_elem_value_set_integer64 (snd_ctl_elem_value_t *obj, unsigned int idx, long long val)
| Set an element members value.
void | snd_ctl_elem_value_set_enumerated (snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val)
| Set an element members value.
void | snd_ctl_elem_value_set_byte (snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val)
| Set an element members value.
void | snd_ctl_elem_set_bytes (snd_ctl_elem_value_t *obj, void *data, size_t size)
| Replace the data stored within the element.
const void * | snd_ctl_elem_value_get_bytes (const snd_ctl_elem_value_t *obj)
| Get the data stored within the element.
void | snd_ctl_elem_value_get_iec958 (const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr)
| Get an elements IEC958 data.
void | snd_ctl_elem_value_set_iec958 (snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr)
| Set an elements IEC958 data.

## Detailed Description

CTL interface - primitive controls.

CTL interface - parse ASCII identifiers and values.

Author
  Abramo Bagnara abram.nosp@m.o@al.nosp@m.sa-pr.nosp@m.ojec.nosp@m.t.org

Date
  2000

CTL interface is designed to access primitive controls. See Control interface page for more details.

Author
  Jaroslav Kysela perex.nosp@m.@per.nosp@m.ex.cz

Date
  2010

## Function Documentation

## ◆ snd_ctl_elem_info_is_indirect()

int snd_ctl_elem_info_is_indirect | ( | const snd_ctl_elem_info_t * | obj | ) |

(DEPRECATED) Get info about values passing policy from a CTL element value

Parameters

  obj | CTL element id/info

Returns
  0 if element value need to be passed by contents, 1 if need to be passed with a pointer

## ◆ snd_ctl_hwdep_info()

int snd_ctl_hwdep_info | ( | snd_ctl_t * | ctl,
|  | snd_hwdep_info_t * | info )

Get info about a hardware dependent device.

Parameters

  ctl | CTL handle
  info | Hardware dependent device id/info pointer

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_hwdep_next_device()

int snd_ctl_hwdep_next_device | ( | snd_ctl_t * | ctl,
|  | int * | device )

Get next hardware dependent device number.

Parameters

  ctl | CTL handle
  device | current device on entry and next device on return

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_pcm_info()

int snd_ctl_pcm_info | ( | snd_ctl_t * | ctl,
|  | snd_pcm_info_t * | info )

Get info about a PCM device.

Parameters

  ctl | CTL handle
  info | PCM device id/info pointer

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_pcm_next_device()

int snd_ctl_pcm_next_device | ( | snd_ctl_t * | ctl,
|  | int * | device )

Get next PCM device number.

Parameters

  ctl | CTL handle
  device | current device on entry and next device on return

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_pcm_prefer_subdevice()

int snd_ctl_pcm_prefer_subdevice | ( | snd_ctl_t * | ctl,
|  | int | subdev )

Set preferred PCM subdevice number of successive PCM open.

Parameters

  ctl | CTL handle
  subdev | Preferred PCM subdevice number

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_rawmidi_info()

int snd_ctl_rawmidi_info | ( | snd_ctl_t * | ctl,
|  | snd_rawmidi_info_t * | info )

Get info about a RawMidi device.

Parameters

  ctl | CTL handle
  info | RawMidi device id/info pointer

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_rawmidi_next_device()

int snd_ctl_rawmidi_next_device | ( | snd_ctl_t * | ctl,
|  | int * | device )

Get next RawMidi device number.

Parameters

  ctl | CTL handle
  device | current device on entry and next device on return

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_rawmidi_prefer_subdevice()

int snd_ctl_rawmidi_prefer_subdevice | ( | snd_ctl_t * | ctl,
|  | int | subdev )

Set preferred RawMidi subdevice number of successive RawMidi open.

Parameters

  ctl | CTL handle
  subdev | Preferred RawMidi subdevice number

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_ump_block_info()

int snd_ctl_ump_block_info | ( | snd_ctl_t * | ctl,
|  | snd_ump_block_info_t * | info )

Get UMP Block info about a UMP RawMidi device.

Parameters

  ctl | CTL handle
  info | UMP Block info pointer

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_ump_endpoint_info()

int snd_ctl_ump_endpoint_info | ( | snd_ctl_t * | ctl,
|  | snd_ump_endpoint_info_t * | info )

Get UMP Endpoint info about a UMP RawMidi device.

Parameters

  ctl | CTL handle
  info | UMP Endpoint info pointer

Returns
  0 on success otherwise a negative error code

## ◆ snd_ctl_ump_next_device()

int snd_ctl_ump_next_device | ( | snd_ctl_t * | ctl,
|  | int * | device )

Get next UMP device number.

Parameters

  ctl | CTL handle
  device | current device on entry and next device on return

Returns
  0 on success otherwise a negative error code